Question: Which combustible powder has the least fusion enthalpy?
Paraphrase: Name the combustible powder with the least fusion enthalpy?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21073023 . ?ent wdt:P2066 ?obj . ?ent wdt:P31 wd:Q21073023} ORDER BY ASC(?obj)LIMIT 5 
Answer: lithium hydride